code: def get_tokens(s):
      if not s:
          return []
      return normalize_answer(s).split()
  
file_path: gluon-nlp/docs/model_zoo/question_answering/eval_utils.py
imports: import collections
  import json
  import copy
  import re
  import string
label_desc: Use image node_id 3 for calling a global function with example usage: get_tokens(s) and returns: normalize_answer, list